CN1560862A - Optical disc and optical disc address reading apparatus and method, information medium - Google Patents

Optical disc and optical disc address reading apparatus and method, information medium Download PDF

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Publication number
CN1560862A
CN1560862A CNA2004100559426A CN200410055942A CN1560862A CN 1560862 A CN1560862 A CN 1560862A CN A2004100559426 A CNA2004100559426 A CN A2004100559426A CN 200410055942 A CN200410055942 A CN 200410055942A CN 1560862 A CN1560862 A CN 1560862A
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CN
China
Prior art keywords
groove
signal
mark
pulse
section
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Pending
Application number
CNA2004100559426A
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Chinese (zh)
Inventor
�ź㴫
古宫成
石桥广通
石田隆
小林良治
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication date
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Publication of CN1560862A publication Critical patent/CN1560862A/en
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    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • G—PHYSICS
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    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G11B20/00601—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity
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Abstract

An optical disc having marks for dispersed addresses that can be easily detected with high precision. A dispersed address comprises synchronization marks, positive marks, and negative marks. Synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.

Description

The address reading apparatus of CD, CD and method, information medium
Technical field
The reading device and the method that the present invention relates to a kind of optically rewritable CD and write the address of CD in advance.
Background technology
In recent years, as the CD that can write down by the user, existing DVD-RAM, CD-RW, MD etc.By forming groove, and form the surface of groove, made these recordable CDs with phase-transition material or photomagnetic material along the plurality of tracks of spiral fashion or concentric circles.And, for the position on the particular optical disk, write down the address by on magnetic track, reserving the mark that can not rewrite.Open an example that discloses relevant address in the flat 8-315426 instructions the spy.
Open flat 8-315426 instructions according to the spy, discontinuous portion is set in groove, this discontinuous portion is formed the pattern corresponding with address signal.At this, the so-called pattern corresponding with address signal is meant discontinuous of each appearance and the two-value signal of upset, is conducting, the look-at-me that is used to generate ATIP (AbsoluteTime In Pregroove) signal.Therefore, discontinuous portion only is used as that expression has or the signal that do not have uses.
But,, in the more address information of needs, also need to provide more efficiently address information in order to make the higher CD of recording density.But in described example in the past, discontinuous trigger pip that only is useful on upset can only have a kind of information (trigger message) of implication.Therefore, need a lot of marks.
And, in described example in the past, because utilized atip signal, so, though the approximate location of energy particular track can't detect the start-of-record point accurately.Therefore, after having carried out record, when appending new record again or when rewriting a part of in the data that record finishes, just might necessary data in front on again covering write new data.And, if inter-track is every being provided with narrowlyer, cross-interference issue just takes place easily.
Summary of the invention
The invention provides a kind of in groove, form discontinuous or variant part, make relevant discontinuous or variant part have two or more implication, the CD of address information can be provided more efficiently.
In addition, the present invention also provides a kind of CD that can improve the bearing accuracy of start-of-record point.
And the present invention also provides a kind of inter-track that can make every the CD that narrows down.
In addition, the present invention also provides a kind of CD that can carry out record-playback with CLV (Constant Linear Velocity) completely.
In addition, the present invention also provides a kind of apparatus and method of coming correctly to read relevant address information with simple formation from the CD that address information is provided by the implication that makes discontinuous of groove or variant part have two or more.
According to an aspect of the present invention, provide a kind of information medium, comprising: track; With the wobble that forms along described track; Wherein said wobble is included in the positive mark that forms in a plurality of unit of the special use that respectively has predetermined length, with the negative flag that forms in respectively having different special-purpose a plurality of unit of predetermined length, described positive mark and described negative flag are used for representing the positional information of described information medium.
According to another aspect of the present invention, provide a kind of information medium, comprising: track; With the wobble that forms along described track; Wherein said wobble is included in the positive mark that forms in a plurality of unit of the special use that respectively has predetermined length; Wherein indicate positive mark by groove part, compare with sine swing, the swing of positive mark further groove comprises the positional information that steeper outside inclination angle and wherein said positive mark are used for representing described information medium.
According to a further aspect of the invention, provide a kind of information medium, comprising: track; With the wobble that forms along described track; Wherein said wobble is included in the negative flag that forms in a plurality of unit of the special use that respectively has predetermined length; Wherein by groove part indication negative flag, compare with sine swing, the swing of negative flag further groove comprises the positional information that steeper inside inclination angle and wherein said negative flag are used for representing described information medium.
Be the rewritable CD with the magnetic track that extends with spiral fashion or concentric circles according to a first aspect of the invention, it is characterized in that: it partly is made of the following stated:
Swing and the groove of formation with sinusoidal wave shape along magnetic track;
The section piece that is provided with along magnetic track;
Be divided into each section piece a plurality of and section that be provided with;
Be formed on the sync mark on top section of each section piece;
Be formed on positive mark or negative flag on each section beyond top section of each section piece;
This just is being marked on the track direction with first width W 1, becomes discontinuous of discontinuous first groove by groove and forms;
This negative flag with second width W 0, becomes discontinuous of discontinuous second groove by groove and forms on track direction;
This sync mark, becomes discontinuous of discontinuous the 3rd groove by groove and forms with the 3rd width Ws in track direction.
Be according to the described CD of first aspect according to a second aspect of the invention, it is characterized in that: the surface of the discontinuous portion of described first, second, third groove is a minute surface.
Be according to the described CD of first aspect according to a third aspect of the invention we, it is characterized in that: the discontinuous portion of described first, second, third groove all is formed on the amplitude largest portion of the groove of swing.
Be according to the described CD of first aspect according to a forth aspect of the invention, it is characterized in that: the discontinuous portion of described first, second, third groove all is formed on the amplitude least part of the groove of swing.
Be according to the described CD of first aspect according to a fifth aspect of the invention, it is characterized in that: described first, second, third width W 1, W0, Ws are all long than the longest mark length that comprises in the record data that write down in the groove, and in below 1/2 of hunting period.
Be according to the described CD of first aspect according to a sixth aspect of the invention, it is characterized in that: described first, second, third width W 1, W0, Ws are all long than the longest mark length that comprises in the record data that write down in the groove, and in below 1/4 of hunting period.
Be according to the described CD of first aspect according to a seventh aspect of the invention, it is characterized in that: the ratio of described first, second, third width W 1, W0, Ws is: wherein any one is made as 1 if incite somebody to action, and then making remaining two ratio is 2: 4.
Be according to the described CD of first aspect according to an eighth aspect of the invention, it is characterized in that: the ratio of described first, second, third width W 1, W0, Ws is 2: 1: 4.
Be according to the described CD of first aspect according to a ninth aspect of the invention, it is characterized in that: described first, second, third width W 1, W0, Ws are respectively 2 bytes, 1 byte, 4 bytes.
Be the rewritable optical disc with the magnetic track that extends with spiral fashion or concentric circles according to the tenth aspect of the invention, it is characterized in that: it partly is made of the following stated:
Swing and the groove of formation with sinusoidal wave shape along magnetic track;
The section piece that is provided with along magnetic track;
Be divided into each section piece a plurality of and section that be provided with;
Be formed on the sync mark on top section of each section piece;
Be formed on positive mark or negative flag on each section beyond top section of each section piece;
This positive mark, this negative flag, this sync mark respectively by groove partly the vertical direction of magnetic track and be on the groove of first direction skew offset portion, groove partly the vertical direction of magnetic track and be under the groove of second direction skew on offset portion or the groove under offset portion and the groove any one of the combination section of offset portion form.
Be according to the described CD in the tenth aspect according to an eleventh aspect of the invention, it is characterized in that: this positive mark is formed by offset portion on the groove, this negative flag is formed by offset portion under the groove, and this sync mark is formed by the combination section of offset portion under offset portion on the groove and the groove.
Be according to the described CD in the tenth aspect according to a twelfth aspect of the invention, it is characterized in that: under the described groove on offset portion, the groove offset portion be arranged on the amplitude the best part of the groove of swing respectively, to the center position skew of magnetic track.
Be according to the described CD in the tenth aspect according to a thirteenth aspect of the invention, it is characterized in that: under the groove of described sync mark on offset portion and the groove offset portion each other with the n+ (1/2) of hunting period doubly (n is positive integer) adjacent.
Be according to the described CD in the 13 aspect according to a fourteenth aspect of the invention, it is characterized in that: described n is 0.
Be the rewritable optical disc with the magnetic track that extends with spiral fashion or concentric circles according to a fifteenth aspect of the invention, it is characterized in that: it partly is made of the following stated:
Swing and the groove of formation with sinusoidal wave shape along magnetic track;
The section piece that is provided with along magnetic track;
Be divided into each section piece a plurality of and section that be provided with;
Be formed on the sync mark on top section of each section piece;
Be formed on positive mark or negative flag on each section beyond top section of each section piece;
The groove rising paraphase portion that this positive mark, this negative flag, this sync mark are turned upside down by the phase place that makes from the paddy of the groove of swing to about 1/4 the part of hunting period respectively, any one of combination section of groove decline paraphase portion, groove rising paraphase portion and groove decline paraphase portion that the phase place of about 1/4 the part of hunting period turns upside down formed.
Be according to the described CD in the 15 aspect according to a sixteenth aspect of the invention, it is characterized in that: this positive mark is formed by groove rising paraphase portion, this negative flag is formed by groove decline paraphase portion, and this sync mark is formed by the combination section of groove rising paraphase portion and groove decline paraphase portion.
Be according to the described CD in the 15 aspect according to a seventeenth aspect of the invention, it is characterized in that: the two ends groove separately of described groove decline paraphase portion and groove rising paraphase portion is discontinuous.
Be according to the described CD in the 15 aspect according to an eighteenth aspect of the invention, it is characterized in that: the two ends separately of described groove decline paraphase portion and groove rising paraphase portion are the grooves of rapid displacement.
Be the rewritable optical disc with the magnetic track that extends with spiral fashion or concentric circles according to a nineteenth aspect of the invention, it is characterized in that: it partly is made of the following stated:
Swing and the groove of formation with sinusoidal wave shape along magnetic track;
The section piece that is provided with along magnetic track;
Be divided into each section piece a plurality of and section that be provided with;
Be formed on the sync mark on top section of each section piece;
Be formed on positive mark or negative flag on each section beyond top section of each section piece;
This positive mark, this negative flag, this sync mark forms groove by about 1/4 part from the paddy of the groove of swing to hunting period with the level of paddy respectively, and change to the level at peak sharp, form groove to about 1/4 the part of next hunting period with the level at peak, the groove rising rectangular portion that is connected with the part at the peak of swinging, form groove from the peak of the groove of swing to about 1/4 the part of hunting period with the level at peak, and be changed to the level of paddy sharp, form groove to about 1/4 the part of next hunting period with the level of paddy, with the groove decline rectangular portion that the part of the paddy that swings is connected, any one of the combination section of groove rising rectangular portion and groove decline rectangular portion forms.
Be according to the described CD in the 19 aspect according to a twentieth aspect of the invention, it is characterized in that: this positive mark is formed by groove rising rectangular portion, this negative flag is formed by groove decline rectangular portion, and this sync mark is formed by the combination section of groove rising rectangular portion and groove decline rectangular portion.
Be according to the described CD in the 19 aspect according to a twenty-first aspect of the invention, it is characterized in that: any one of part that part, the multicycle that part, the multicycle that this positive mark, this negative flag, this sync mark have repeated groove rising rectangular portion by the multicycle respectively repeated groove decline rectangular portion repeated the combination section of groove rising rectangular portion and groove decline rectangular portion forms.
Be according to the described CD of the 20 one side according to a twenty-second aspect of the invention, it is characterized in that: the part that this positive mark has repeated groove rising rectangular portion by the multicycle forms, the part that this negative flag has repeated groove decline rectangular portion by the multicycle forms, and the part that this sync mark has repeated the combination section of groove rising rectangular portion and groove decline rectangular portion by the multicycle forms.
Be according to the sync mark that comprises in the described CD of first aspect, positive mark, negative flag according to a twenty-third aspect of the invention, collection is by disperseing to be included in " 1 ", the data of " 0 " that positive mark, negative flag in the section piece obtain, and read the address reading apparatus of the address of this section piece, it is characterized in that: it partly is made of the following stated:
Irradiating laser on the magnetic track of CD is to be received catoptrical shaven head (2) along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate the subtracter (4) of difference signal;
Remove the hunting frequency composition of the magnetic track of swing, generate the wave filter (6) of discontinuous pulse of groove;
The width of discontinuous pulse of detecting groove is differentiated sync mark, positive mark, negative flag according to width, generates the arbiter (12) of synchronization mark signal, positive mark signal, negative mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate the detuner (14) of " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD of first aspect, positive mark, negative flag according to a twenty-fourth aspect of the invention, collection is by disperseing to be included in " 1 ", the data of " 0 " that positive mark, negative flag in the section piece obtain, and read the address read access method of the address of this section piece, it is characterized in that:
Irradiating laser on the magnetic track of CD is to be received reflected light along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate difference signal;
Remove the hunting frequency composition of the magnetic track of swing, generate discontinuous pulse of groove;
The width of discontinuous pulse of detecting groove is differentiated sync mark, positive mark, negative flag according to width, generates synchronization mark signal, positive mark signal, negative mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD in the tenth aspect, positive mark, negative flag according to the twenty-fifth aspect of the invention, collection is by disperseing to be included in " 1 ", the data of " 0 " that positive mark, negative flag in the section piece obtain, and read the address reading apparatus of the address of this section piece, it is characterized in that: it partly is made of the following stated:
Irradiating laser on the magnetic track of CD is to be received catoptrical shaven head (2) along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate the subtracter (4) of difference signal;
Remove the hunting frequency composition of the magnetic track of swing, the wave filter (6) of offset portion pulse on the groove of offset portion pulse and forward under the groove of generation negative sense;
Right any one with offset portion pulse under offset portion pulse and the groove on offset portion pulse, the groove under offset portion pulse, the groove on the groove differentiated positive mark, negative flag, sync mark, generates the arbiter (52,54,12) of positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate the detuner (14) of " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD in the tenth aspect, positive mark, negative flag according to the twenty-sixth aspect, collection is obtained by the positive mark, the negative flag that disperse to be included in the section piece " 1 ", the data of " 0 ", and read the address read access method of the address of this section piece, it is characterized in that:
Irradiating laser on the magnetic track of CD is to be received reflected light along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate difference signal;
Remove the hunting frequency composition of the magnetic track of swing, offset portion pulse on the groove of offset portion pulse and forward under the groove of generation negative sense;
Right any one with offset portion pulse under offset portion pulse and the groove on offset portion pulse, the groove under offset portion pulse, the groove on the groove differentiated positive mark, negative flag, sync mark, generates positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD in the 15 aspect, positive mark, negative flag according to a twenty-seventh aspect of the invention, collection is by disperseing to be included in " 1 ", the data of " 0 " that positive mark, negative flag in the section piece obtain, and read the address reading apparatus of the address of this section piece, it is characterized in that: it partly is made of the following stated:
Irradiating laser on the magnetic track of CD is to be received catoptrical shaven head (2) along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate the subtracter (4) of difference signal;
Remove the hunting frequency composition of the magnetic track of swing, the wave filter (6) of the groove decline paraphase portion's pulse of generation negative sense and the groove rising paraphase portion pulse of forward;
Differentiate positive mark, negative flag, sync mark with the pulse of groove rising paraphase portion, the pulse of groove decline paraphase portion, groove decline paraphase portion's pulse and right any one of groove rising paraphase portion's pulse respectively, generate the arbiter (52,54,12) of positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate the detuner (14) of " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD in the 15 aspect, positive mark, negative flag according to a twenty-eighth aspect of the invention, collection is obtained by the positive mark, the negative flag that disperse to be included in the section piece " 1 ", the data of " 0 ", and read the address read access method of the address of this section piece, it is characterized in that:
Irradiating laser on the magnetic track of CD is to be received reflected light along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate difference signal;
Remove the hunting frequency composition of the magnetic track of swing, generate the groove decline paraphase portion's pulse of negative sense and the groove rising paraphase portion pulse of forward;
Differentiate positive mark, negative flag, sync mark with the pulse of groove rising paraphase portion, the pulse of groove decline paraphase portion, groove decline paraphase portion's pulse and right any one of groove rising paraphase portion's pulse respectively, generate positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD in the 19 aspect, positive mark, negative flag according to the twenty-ninth aspect, collection is by disperseing to be included in " 1 ", the data of " 0 " that positive mark, negative flag in the section piece obtain, and read the address reading apparatus of the address of this section piece, it is characterized in that: it partly is made of the following stated:
Irradiating laser on the magnetic track of CD is to be received catoptrical shaven head (2) along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate the subtracter (4) of difference signal;
Remove the hunting frequency composition of the magnetic track of swing, the wave filter (6) of the groove decline rectangular portion pulse of generation negative sense and the groove rising rectangular portion pulse of forward;
Differentiate positive mark, negative flag, sync mark with the pulse of groove rising rectangular portion, the pulse of groove decline rectangular portion, groove decline rectangular portion pulse and right any one of groove rising rectangular portion pulse respectively, generate the arbiter (52,54,12) of positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate the detuner (14) of " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD in the 19 aspect, positive mark, negative flag according to a thirtieth aspect of the invention, collection is obtained by the positive mark, the negative flag that disperse to be included in the section piece " 1 ", the data of " 0 ", and read the address read access method of the address of this section piece, it is characterized in that:
Irradiating laser on the magnetic track of CD is to be received reflected light along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate difference signal; Remove the hunting frequency composition of the magnetic track of swing, generate the groove decline rectangular portion pulse of negative sense and the groove rising rectangular portion pulse of forward;
Differentiate positive mark, negative flag, sync mark with the pulse of groove rising rectangular portion, the pulse of groove decline rectangular portion, groove decline rectangular portion pulse and right any one of groove rising rectangular portion pulse respectively, generate positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD of the 20 one side, positive mark, negative flag according to a thirty-first aspect of the invention, collection is by disperseing to be included in " 1 ", the data of " 0 " that positive mark, negative flag in the section piece obtain, and read the address reading apparatus of the address of this section piece, it is characterized in that: it partly is made of the following stated:
Irradiating laser on the magnetic track of CD is to be received catoptrical shaven head (2) along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate the subtracter (4) of difference signal;
Remove the hunting frequency composition of the magnetic track of swing, the wave filter (6) of the groove decline rectangular portion pulse of generation negative sense and the groove rising rectangular portion pulse of forward;
Calculate first integrating instrument (93) of quantity of the groove decline rectangular portion pulse of the negative sense that comprises in the piece;
Calculate second integrating instrument (94) of quantity of the groove rising rectangular portion pulse of the forward that comprises in the piece;
Compare first calculated value of first integrating instrument and second calculated value of second integrating instrument, under any one situation of abundant situation, first calculated value and second calculated value situation about equally of the abundant situation of first calculated value, second calculated value, differentiate positive mark, negative flag, sync mark, generate the arbiter (95～99) of positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate the detuner (14) of " 1 ", " 0 ".
Be according to the sync mark that comprises in the described CD of the 20 one side, positive mark, negative flag according to a thirty-second aspect of the invention, collection is obtained by the positive mark, the negative flag that disperse to be included in the section piece " 1 ", the data of " 0 ", and read the address read access method of the address of this section piece, it is characterized in that:
Irradiating laser on the magnetic track of CD is to be received reflected light along track direction by two two photo detectors cutting apart;
Obtain poor from the signal of two photo detectors, generate difference signal;
Remove the hunting frequency composition of the magnetic track of swing, generate the groove decline rectangular portion pulse of negative sense and the groove rising rectangular portion pulse of forward;
The quantity of the groove decline rectangular portion pulse of the negative sense that comprises in the piece is calculated as first calculated value;
The quantity of the groove rising rectangular portion pulse of the forward that comprises in the piece is calculated as second calculated value;
Compare first calculated value and second calculated value, under any one situation of abundant situation, first calculated value and second calculated value situation about equally of the abundant situation of first calculated value, second calculated value, differentiate positive mark, negative flag, sync mark, generate positive mark signal, negative mark signal, synchronization mark signal;
Corresponding to from a synchronization mark signal to positive mark signal, negative mark signal that next synchronization mark signal comprised, generate " 1 ", " 0 ".
The 33 aspect according to the present invention is according to the described CD in the 19 aspect, it is characterized in that: the piece mark that also has the starting position of expression section piece in the described sync mark.
The 34 aspect according to the present invention is according to the described CD in the 33 aspect, it is characterized in that: described mark is provided with discontinuous and form on the magnetic track groove.
The 35 aspect according to the present invention is according to the described CD in the 33 aspect, it is characterized in that: the width that described mark changes the magnetic track groove partly forms.
The 36 aspect according to the present invention is according to the described CD in the 33 aspect, it is characterized in that: the amplitude that described mark changes swing partly forms.
The 37 aspect according to the present invention is according to the described CD in the 19 aspect, it is characterized in that: according to positive information, negative information, formed the swing in 1 cycle, made its dutycycle difference.
The 30 eight aspect according to the present invention is according to the described CD in the 19 aspect, it is characterized in that: only the edge of a side of magnetic track groove is provided with swing.
(beneficial effect compared with prior art)
Because in the groove of swing, be provided with groove variations portion with a plurality of different forms,, can also make each groove variations portion have other implication so just do not discern having or not of this variant part.Therefore, can provide more information with the groove variations portion of negligible amounts.
And address reading apparatus can efficiently, correctly read to disperse the address with simple formation.
Description of drawings
Following brief description accompanying drawing.
Figure 1A is the vertical view of CD of the present invention, the synoptic diagram of Figure 1B section of being piece.
Fig. 2 A section of being piece is provided with the key diagram that disperses the address, and Fig. 2 B has formed the synoptic diagram that disperses the groove of address mark.
Fig. 3 is the partial enlarged drawing of the CD with the discontinuous portion of groove of embodiment 1.
Fig. 4 is the block diagram of the address reading apparatus of CD shown in Figure 3.
Fig. 5 is the signal waveforms of the main point of device shown in Figure 4.
Fig. 6 is the block diagram of arbiter shown in Figure 4.
Fig. 7 is the block diagram of detuner shown in Figure 4.
Fig. 8 is that the variation of the discontinuous portion of expression groove is the enlarged drawing of groove offset portion.
Fig. 9 is that the variation of the discontinuous portion of expression groove is the enlarged drawing of groove offset portion.
Figure 10 is the partial enlarged drawing based on the CD of groove offset portion of having of embodiment 2.
Figure 11 is the block diagram of the address reading apparatus of CD shown in Figure 10.
Figure 12 is when using the CD of Figure 10, from the oscillogram of the output signal of the subtracter of Figure 11.
Figure 13 is when using the CD of Figure 10, from the oscillogram of the output signal of the wave filter of Figure 11.
Figure 14 is when using the CD of Figure 10, from the oscillogram of the output signal of the comparer of Figure 11.
Figure 15 is the enlarged drawing of discontinuous groove paraphase portion.
Figure 16 is the enlarged drawing of continuous recess paraphase portion.
Figure 17 is the partial enlarged drawing that has based on the CD of the mark of groove paraphase portion.
Figure 18 is when using the CD of Figure 17, from the oscillogram of the output signal of the subtracter of Figure 11.
Figure 19 is when using the CD of Figure 17, from the oscillogram of the output signal of the wave filter of Figure 11.
Figure 20 is when using the CD of Figure 17, from the oscillogram of the output signal of the comparer of Figure 11.
Figure 21 is the enlarged drawing of groove rectangular portion.
Figure 22 is the partial enlarged drawing that has based on the CD of the mark of groove rectangular portion.
Figure 23 is when using the CD of Figure 22, from the oscillogram of the output signal of the subtracter of Figure 11.
Figure 24 is when using the CD of Figure 22, from the oscillogram of the output signal of the wave filter of Figure 11.
Figure 25 is when using the CD of Figure 22, from the oscillogram of the output signal of the comparer of Figure 11.
Figure 26 is the enlarged drawing of CD of the discontinuous portion of groove that is provided with the starting position of unified record.
Figure 27 is the partial enlarged drawing that has based on the CD of the mark of continuous recess rectangular portion.
Figure 28 is when using the CD of Figure 27, from the oscillogram of the output signal of the subtracter of the rectangular portion detecting device of Figure 31.
Figure 29 is when using the CD of Figure 27, from the oscillogram of the output signal of the wave filter of the rectangular portion detecting device of Figure 31.
Figure 30 is when using the CD of Figure 27, from the oscillogram of the output signal of the comparer of the rectangular portion detecting device of Figure 31.
Figure 31 is the block diagram of the address reading apparatus of CD shown in Figure 27.
Figure 32 is the vertical view that expression has changed the swing of dutycycle.
Figure 33 is the vertical view of expression piece mark.
Figure 34 is a vertical view of representing other piece mark.
The stereographic map of Figure 35 when a side at groove is provided with swing.
Embodiment
Below, be illustrated with regard to embodiments of the invention with reference to accompanying drawing.
(embodiment 1)
Figure 1A is the structural drawing of the CD of the embodiment of the invention 1, and 1B is a key diagram of having represented the arrangement of section.In Figure 1A, the 101st, optical disc substrate, the 102nd, preformed title portion when making CD, the 103rd, recording portion that can recorded information, the information unit of 104 expression data i.e. section.In Figure 1B, the 105th, expression is to give fixed number, and for example 32 is the section piece of a unit.
On optical disc substrate 101, be pre-formed and the phase state resembled change noncrystal, the crystal, carry out record, during reproduction, read the phase change film of signal according to reflection differences.
Below, with reference to Fig. 2 A, describe the relation of section 104 and section piece 105 in detail.
The CD of present embodiment has constituted track by continuous section piece 105.As mentioned above, each section piece 105 is made of 32 sections 104, and the structure of each section 104 is: having title portion 102 in the beginning part, then is the recording portion 103 of having carried out the record-playback of signal.In addition, the length of a section is 2448 bytes.
In each section piece 105, in being configured in top section 104 title portion 102, be provided with sync mark " S ".By detecting this sync mark " S ", the beginning of energy detection segment piece 105.
Then, be provided with positive mark or negative flag in second section 104 the title portion 102 in being configured to this section piece 105.At this, positive mark is distributed to the information of " 1 ", and negative flag is distributed to the information of " 0 ".In the example shown in Fig. 2 a, be configured in second section 104 the title portion 102 and distributed negative flag " 0 ".Like this, in the title portion of second later each section 104 (being called subsequent segment), can increase by 1 information respectively.
Like this, if the information of the title portion of contained 32 sections of the section of gathering piece 105 just can generate by sync mark " S " and follows its positive mark " 1 " or 31 information of negative flag " 0 " formation.In each section piece 105,31 information are divided into every conversely speaking,, disperse, be configured in 31 sections 104,, begin to have disposed sync mark at it for the beginning of detection segment piece 105.The address that disperses 0,1 configuration like this is called the dispersion address.
At this, in above-described 31 information, 19 information is main information, and 12 information is secondary information.The positional information of this main information section of being piece 105 of 19.At this moment, can carry out the position probing of 19 powers=524288 a section piece 105 of 2.Therefore, in CD integral body, be 0 with the address that begins the section piece, after, each section piece of following, distribution locations information increases by 1 information, if 19 the main information absolute location information as section piece 105, for example, section 104 has the information of 2048 bytes, section piece 105 has the information of 65536 (=2048 * 32) byte, then according to 19 bit position information, and the maximum positional information that can distribute the data that can visit 34 GB.
And 12 secondary information distribution is when be short of owing to defective any position of 19 main information and 12 s' secondary information, or the mistake that also can correct during the error-detecting during reproduction is corrected symbol.This for example is that the mistake of 31 all information is corrected symbol.In addition, because the positional information of section piece 105 is in continuous section piece 105 each information of 1 that increase, high-order information can be from section piece 105 predictions of going ahead of the rest, so also can correct symbol to for example 8 of low levels as mistake.
About disperseing the address, be willing to have been described in detail among the flat 11-343060 the spy.
Shown in Fig. 2 B, in the present invention, CD 101 has a plurality of tracks of spiral fashion or concentric circles (being spiral fashion in an embodiment), has disposed section on track.In the example of Figure 1A, represented imaginary line (dotted line) along radial direction, only on imaginary line, arranged title portion (comprise sync mark " S ", positive mark " 1 ", negative flag " 0 " any one), but shown in Fig. 2 B, be preferably in any radial direction and do not arrange title portion.
In addition, as shown in Figure 3, form at groove, and between the track that is connected, for example between groove n and groove n+1, become land.Land is formed by minute surface.Groove becomes to wriggle and is wavy wobble shape, in an example, has the swing in 153 cycles in 1 section.At this moment, the cycle of swing is 16 bytes.When the data of record were write down with the 8-16 modulation, if 1 clock length is T, the then the shortest 3T that is labeled as, longest mark were 14T.In addition, represent with 1 byte=16T.
In addition, in the present embodiment, as shown in Figure 3, positive mark " 1 " is that discontinuous of first groove of W1 forms by the width that extends in track direction, negative flag " 0 " is that discontinuous of second groove of W0 forms by the width that extends in track direction, and sync mark " S " is that discontinuous of the 3rd groove of Ws forms by the width that extends in track direction.The discontinuous portion of these grooves has and the mirror surface structure same with land.
Sync mark " S " there is no need to be arranged in the radial direction of CD.Other mark too.Therefore, segment length can both be same length in the optional position of CD, so can realize CLV completely.
In addition, because can be from opening entry after the groove point of discontinuity, so can obtain high-precision start-of-record point.
Form as follows based on the sync mark of so discontinuous portion of groove, positive mark, negative flag.
The structure that forms groove CD before is: smearing photoresist on the mirror finish comprehensively.If make laser radiation that the revolution of this CD makes rectilinear propagation, swing to magnetic track, just formed the groove of swing.If interrupt laser when forming groove, according to the time span of interrupting, groove becomes discontinuous, has formed sync mark " S ", positive mark " 1 " or negative flag " 0 ".In the embodiment of first-selection, sync mark " S ", positive mark " 1 " or negative flag " 0 " are that the amplitude the best part forms in the peak or the paddy of wobble all, make the detection of the relevant discontinuous portion of groove become easy.Formed mark with discontinuous of groove like this, so can process with beam of laser.
Determined as follows with width Ws separately, W1, the W0 of sync mark " S ", positive mark " 1 " or negative flag " 0 " the discontinuous portion of corresponding groove.
For not the recording data signal in the tracking error signal that bleeds as noise with one that disperses address signal be sync mark " S ", positive mark " 1 " or negative flag " 0 " any one signal misidentification, confuse, the mark width of selection is preferably in more than the longest mark length that comprises in the record data.
In addition, sync mark " S ", positive mark " 1 " or negative flag " 0 " all are configured in the amplitude maximum point of swing, and therefore, mark width is necessary for below 1/2 of hunting period, in order to improve accuracy of detection, is preferably below 1/4 of hunting period.
The width of the discontinuous portion of groove arbitrarily of sync mark in view of the above, " S ", positive mark " 1 " or negative flag " 0 " is:
1/2 (1) of 14T＜W＜hunting period
Be preferably:
1/4 (2) of 14T＜W＜hunting period
Satisfy the condition of being somebody's turn to do (1), (2), the width of the discontinuous portion of groove that represents sync mark " S ", positive mark " 1 " or negative flag " 0 " for example is set with the ratio of identification easily at 4: 2: 1.Though the ratio of the discontinuous portion of groove can be 4 arbitrarily, but, preferably making the ratio of the discontinuous portion of pairing the 3rd groove of most important sync mark " S " in the identification is 4, and the positive pairing ratio of mark " 1 " is 2 (or 1), and the pairing ratio of negative flag " 0 " is 1 (or 2).Concrete example as the width of the discontinuous portion of groove is: discontinuous (sync mark " S ")=4 bytes of the 3rd groove, discontinuous (positive mark " 1 ")=2 bytes of first groove; Discontinuous (negative flag " 0 ")=1 byte of second groove.As mentioned above, the discontinuous portion of groove has not only represented having or not of the relevant discontinuous portion of groove, has also represented 3 kinds of different implications (sync mark " S ", positive mark " 1 " or negative flag " 0 ") by the length of the discontinuous portion of groove.
Fig. 4 has represented the reading device of dispersion address shown in Figure 3, and Fig. 5 has represented the oscillogram of output signal of the main point of reading device.In Fig. 4, the 2nd, by the light-emitting component 2c of emission laser and the photo detector 2a of cutting apart in track direction 2, the shaven head that 2b constitutes, the 4th, obtain from photo detector 2a, the signal of 2b poor, the subtracter of output difference signal Sa (Fig. 5), the 6th, radio-frequency component is passed through, the Hi-pass filter of output discontinuous signal Sb of groove (Fig. 5), the 8th, discontinuous signal Sb of groove and the given fault value Sc (Fig. 5) that device 10 is set from the fault value are compared, the comparer of discontinuous the signal Sd of groove (Fig. 5) of output binaryzation, the 12nd, discontinuous of discontinuous the signal Sd of groove of judgement binaryzation and first groove (positive mark " 1 "), discontinuous of second groove (negative flag " 0 "), the arbiter of which correspondence of the 3rd groove discontinuous (sync mark " S "), the 14th, collect later 31 positive marks " 1 " of sync mark " S " or negative flag " 0 " in order, disperseing the address to become the detuner of continuation address.From the difference signal Sa of subtracter 4 outputs are push-pull signals, are used so also can be used as tracking error signal.
As shown in Figure 5, difference signal Sa depicts sine wave according to the swing of magnetic track.In the place of fluted discontinuous portion, difference signal becomes 0, so exported 0 level with the pulse width corresponding with the width of the discontinuous portion of groove.The sine wave of having removed swing with wave filter 8 is that groove discontinuous signal Sb of low-frequency component only exists the pulse based on the discontinuous portion of groove.This pulse and given fault value comparison, generate discontinuous signal Sd of groove of 2 values.
Fig. 6 has represented the details of arbiter 12.The 22nd, discontinuous signal Sd of groove of reception 2 values, the pulse-width detector of the pulse width of detection signal Sd.If the pulse width of the signal Sd that detects just sends to and ignores handling part 24 below 14T, this signal is left in the basket.
If the pulse width of the signal Sd that detects just sends to 0-output processing part 26 more than 14T, confirm as discontinuous signal of second groove, exported the signal Se (Fig. 5) of expression " 0 ".Signal Se is reset by discontinuous signal Sd of Next groove.
If the pulse width of the signal Sd that detects below the 48T, then sends to 1-output processing part 28 more than 24T, confirm as discontinuous signal of first groove, exported the signal Sf (Fig. 5) of expression " 1 ".Signal Sf is reset by discontinuous signal Sd of next groove.
If the pulse width of the signal Sd that detects below the 80T, then sends to S-output processing part 30 more than 48T, confirm as discontinuous signal of the 3rd groove, exported the signal " S " of the beginning of expression section piece.Signal " S " is reset by discontinuous signal Sd of next groove.
If the pulse width of the signal Sd that detects then sends to and ignores handling part 32 more than 80T, this signal is left in the basket.In a word, the signal Se of expression " 0 " is corresponding with negative flag " 0 ", and the signal Sf of expression " 1 " is corresponding with positive mark " 1 ", and signal " S " is corresponding with sync mark " S ".
From the signal Se of the expression " 0 " of 0-output processing part 26, from the signal Sf of the expression " 1 " of 1-output processing part 28, be sent to detuner 14, be identified as an address that disperses the address from the signal " S " of S-output processing part 30.
As mentioned above, at arbiter 12, not to differentiate having or not of groove, but, generated the signal (signal Sf, the signal Se of expression " 0 " of expression " 1 ", the signal of expression " S ") of representing 3 kinds of different implications according to the length of discontinuous signal of groove.
Fig. 7 represents the details of detuner 14.The 42nd, signal Se is transformed to 1 signal " 0 ", signal Sf is transformed to the scrambler of 1 signal " 1 ", the 44th, receive 1 signal " 0 " or 1 signal " 1 " in order from scrambler 42, disperse 31 serials the address to be transformed to parallel shift register, the 46th, response signal " S ", remain on the breech lock of 31 the address signal of arranging in the shift register, the 48th, for 31 12 of low levels being used for the odd even scrambler of the code that parity check uses, 50 codes that are to use parity check to use carry out the mistake that the mistake of 31 a high position 19 bit address is corrected is corrected handling part.Like this, 19 bit address have been exported from detuner 14 for each section piece.
And according to the kind of CD, the groove that has becomes recess, and what have becomes protuberance.In addition, the title portion 102 that is made of minute surface portion also can begin to write data from behind.
More than Shuo Ming address reading apparatus can read efficiently and disperse the address with simple structure.In addition, because use difference signal to carry out reading of sync mark, positive mark, negative flag, so can be easily separate with the information signal that writes down on the groove.
In addition, because sync mark, positive mark, negative flag all are converged in the width of the most good degree of swing, so can not increase crosstalking of adjacent inter-track.
In addition, interior Monday of CD side and outer Monday side not the length of the section of change disposed section, and the cut-off rule that there is no need the section of making piece is consistent with the radial direction of CD, so can realize CLV completely.The example of endless belt CLV shown in Figure 1A, the cut-off rule that has disposed the section of title and section piece is consistent at inter-track, centralized configuration when the radial direction of CD, title in addition part and the part of title, the light transmission of the recording layer of CD has a great difference.Even the light transmission difference is also no problem when the record surface of CD is individual layer, but when the record surface of CD is made of the layer more than 2 layers or 2 layers, the localized variation generation of the transmissivity of recording layer from the upper strata to the crosstalking of lower floor, so bad.In the CD of the example shown in Fig. 2 B, because can realize CLV completely, so there is no need to make title portion to concentrate on the radial direction of CD, the energy decentralized configuration even in the CD of sandwich construction, also can reduce crosstalking of interlayer.
In addition, in CLV completely, because compare, can reduce useless space, so can improve the capacity of CD with endless belt CLV.
Can be with a branch of smooth machined grooves and sync mark, just mark, negative flag.
In addition, in the CD of above explanation, interrupt forming the laser of groove, form the discontinuous portion of groove, still,, laser is staggered in moment, form groove offset portion 62 or 63 as Fig. 8, shown in Figure 9.At this moment, only need to adjust the time span that staggers.
In the present embodiment, partly disposed identification marking, but there is no need partly to detect identification marking, for example also can divide configuration in the tail portion of section in the beginning of section in the beginning of section.
As mentioned above, the CD of embodiment 1 forms the discontinuous portion of groove of different length at the beginning title 102 of each section, make discontinuous of groove self have any one implication of sync mark " S ", positive mark " 1 " or negative flag " 0 ", can be with the address of the littler space section of providing piece.
In addition, the CD of present embodiment is applicable to the laser of self-emission device 2c to be to use near the high density compact disc of the wavelength of 400nm.It is the reasons are as follows.
CD of the present invention is the CD of record-playback type, and the optical disc surface in the groove is in the phase-transition material of crystalline state (non-recording status), for example is made of germanium antimonial or silver-colored indium compound.If the illuminated laser of given level then by forming the mark that becomes non-crystalline state (recording status) from crystalline state (non-recording status) mutually, has carried out record.By shining lower level laser, according to the catoptrical power from the part of the part of the different crystalline state of reflectivity and non-crystalline state, the information of playback record.If laser is 830nm or 650nm band, from the reflected light of the part of non-crystalline state (recording status) recently a little less than the reflected light of the part of crystalline state (non-recording status).In addition, the reflected light of minute surface portion is recently from the partial reflection light intensity of crystalline state, thus from the reflected light of the part of the part of minute surface portion, crystalline state, non-crystalline state be respectively by force, in, a little less than, can easily discern three's part.
But, if laser has used near the wavelength the 400nm, then reflectivity upset, from the reflected light of the part of non-crystalline state (recording status) recently from the reflective light intensity of the part of crystalline state (non-recording status).Therefore, from the reflected light of the part of the part of minute surface portion, crystalline state, non-crystalline state be respectively strong slightly, in, strong, the identification of the part of minute surface portion and non-crystalline state (recording status) difficulty that becomes.But, in the present embodiment, be set to be different from the width of the width of record mark, so identification record mark easily because minute surface portion is the width of the discontinuous portion of groove.
(embodiment 2)
In embodiment 2, replace the different discontinuous portion of groove of width shown in Figure 3, as shown in figure 10, utilize groove variations portion be under the groove on offset portion 65, the groove offset portion 66 and his combination section 67 provide and disperse the address.As shown in figure 10, represent positive mark " 1 " separately with offset portion on the groove 66, sync mark " S " is represented in combination section 67 with offset portion 66 on offset portion under the groove 65 and the groove that occurs in the preset time of following, if offset portion 65 under the groove, and offset portion 66 on the absent variable groove in the preset time of following, expression negative flag " 0 ".Offset portion on offset portion under the groove and the groove is generically and collectively referred to as the groove offset portion.Any one of portion 65, portion 66, combination section 67 can be as sync mark, positive mark, negative flag, and to detect the little sync mark of frequency be combination section 67 but preferably make.Also be same in the back in Shuo Ming the variation.
To the center of magnetic track the skew of moment is set by part, forms offset portion 65 under the groove from the peak of the groove of swing.To the center of magnetic track the skew of moment is set by part, forms offset portion 66 on the groove from the paddy of the groove of swing.By the skew of moment is set, form combination section 67 on peak of swinging that is connected and paddy.
And, in the combination section 67 of Figure 10, offset portion 66 1/2 adjacent with hunting period on offset portion 65 and the groove under the groove, still, also can with the n+ (1/2) of hunting period doubly (n is a positive integer) adjacent.
In addition, offset portion can also have form shown in Figure 9 except form shown in Figure 8 under the groove.For offset portion on the groove, also can take same form.
Figure 11 has represented the reading device of dispersion address shown in Figure 10.Figure 12, Figure 13, Figure 14 have represented the oscillogram of output signal of the main point of reading device.In Figure 11,, omitted detailed description thereof to having adopted same symbol with the same part of reading device shown in Figure 4.The 2nd, shaven head, the 4th, the subtracter of output difference signal Sa (Figure 12), the 6th, the Hi-pass filter of output groove offset portion signal Sb (Figure 13), the 52nd, offset portion signal Sb on the groove and given first fault value+Vth (Figure 13) comparison, export the comparer of offset portion signal Si (Figure 14) on the groove of 2 values, the 54th, offset portion signal Sb under the groove and given second fault value-Vth (Figure 13) comparison, export the comparer of offset portion signal Sj (Figure 14) under the groove of 2 values, the 56th, the groove offset portion signal Si of differentiation 2 values, the Sj and the first groove offset portion (positive mark " 1 "), the second groove offset portion (negative flag " 0 "), the arbiter of which correspondence of the 3rd groove offset portion (sync mark " S "), the 14th, disperseing the address to become the detuner of continuation address.
The difference signal of the combination section 67 of offset portion on offset portion and the groove under signal Sa (S) the expression groove of Figure 12, the only fluted difference signal of offset portion 65 down of signal Sa (0) expression, the only fluted difference signal of going up offset portion 66 of signal Sa (1) expression.When the part at peak at the groove of swing has downward offset portion, generated the pulse of negative sense, when the part in the paddy of the groove of swing has upwards offset portion, generated the pulse of forward.
The signal Sb (S) of Figure 13, Sb (0), Sb (1) are respectively the waveforms that has removed the low-frequency component of signal Sa (S), Sa (0), Sa (1).
The signal Si (S) of Figure 14, Sj (S) are respectively the signal of the direct impulse of signal Sb (S), negative-going pulse 2 values.Because contain the both sides of direct impulse, negative-going pulse among the signal Sb (S), so all have pulse among Si (S), the Sj (S).Only contain negative-going pulse in signal Sb (0), do not have pulse in Si (0), there is pulse in Sj in (0).Only contain direct impulse in signal Sb (1), have pulse in Si (1), there is pulse in Sj (1) in not.
Arbiter 56 is worked as follows.
After the pulse of any one party of received signal Si or signal Sj, in the given time (hunting period 1/2 in) when having received the opposing party's pulse, detect and be sync mark " S ", " S " signal of output expression sync mark " S ".This " S " signal is held and detects next mark.
After the pulse that receives Si, in the given time (hunting period 1/2 in) when not having the pulse of Sj, detect and be positive mark " 1 ", " 1 " signal of positive mark " 1 " is represented in output.This " 1 " signal is held and detects next mark.
After the pulse that receives Sj, in the given time (hunting period 1/2 in) when not having the pulse of Si, detect and be negative flag " 0 ", " 0 " signal of negative flag " 0 " is represented in output.This " 0 " signal is held and detects next mark.
Above-described " S " signal, " 1 " signal, " 0 " signal all are the signals of expression in following two row of Fig. 5, respectively from 3 output lines outputs of the arbiter of Figure 11.
Detuner 14 is similarly worked with detuner shown in Figure 7.
Under the groove on offset portion 65 and the groove offset portion 66 not only represented having or not of relevant offset portion, also comprise the information of offset direction up and down.Therefore, can distinguish, generate signal Si, Sj.
In addition, hunting period 1/2 in, can utilize under the groove offset portion on offset portion 65, the groove, discern 3 kinds of implications (" S ", " 0 ", " 1 ").
In addition, because sync mark, positive mark, negative flag converge in the width of peak swing of swing, so can not increase crosstalking of adjacent inter-track.
In addition, interior Monday of CD side and outer Monday side not the length of the section of change disposed section, and the cut-off rule that there is no need the section of making piece is consistent with the radial direction of CD, so can realize CLV completely.
In addition, can be with a branch of smooth machined grooves and sync mark, positive mark, negative flag.
Because leave from track center and to have formed sync mark, positive mark, negative flag, so even write down information data along track center, the degree of the signal of doping information data is little in the detection signal of sync mark, positive mark, negative flag.
In addition, when with push-pull signal detecting groove offset portion, because difference signal becomes big difference signal, so can carry out the detection of groove offset portion exactly.
(variation 1)
First variation of from Figure 15 to Figure 20, having represented the groove variations portion of embodiment 2.
In Figure 10,, in first variation of Figure 17, become groove decline paraphase portion 74, groove rising paraphase portion 75 respectively though used under the groove offset portion 66 on offset portion 65, the groove.Even being phase places of about 1/4 the part of the hunting period that begins with the peak to the sloping portion of paddy from groove, the peak of the groove of sine wave swing, groove decline paraphase portion 74 turns upside down, even the phase place of about 1/4 the part of the hunting period that groove rising paraphase portion 75 is the paddy of paddy to the rising part at peak from groove of groove to begin turns upside down.Groove decline paraphase portion, groove rising paraphase portion are generically and collectively referred to as groove paraphase portion.
As shown in figure 17, sync mark " S " is by part 76 expressions that comprised groove decline paraphase portion 74, groove rising paraphase portion 75 continuously, negative flag " 0 " is represented that by the part that only comprises groove decline paraphase portion 74 positive mark " 1 " is represented by the part that only comprises groove rising paraphase portion 75.Be used for expressive notation hunting period 1/4 part two ends as shown in figure 15, can be discontinuous, also can be as shown in figure 16, be groove jumpy.
Reading device with Figure 11 has read these marks.
Figure 18 has represented the difference signal of 3 the pairing groove paraphase of mark portions shown in Figure 17.These difference signals are that the subtracter 4 from Figure 11 obtains.From difference signal Sa (S) as can be known, at phase inversion, in the groove part jumpy from the top down, obtained to bottom right difference signal jumpy, and at phase inversion, in the groove part jumpy from bottom to top, obtained to upper right difference signal jumpy.
Figure 19 has represented to make difference signal to pass through the signal of Hi-pass filter 6.Difference signal jumpy shows as negative-going pulse to the bottom right, shows as direct impulse to upper right difference signal jumpy.
In Figure 20, represent signal that the pulse of forward is taken out as 2 value signals from comparer 52 with signal Si, represent the pulse of negative sense from the signal of comparer 54 with signal Sj as the taking-up of 2 value signals.
At this moment, arbiter 56 is worked as follows.
After the pulse of any one party of received signal Si or signal Sj, when (in hunting period) received the opposing party's pulse in first preset time, detect and be sync mark " S ", " S " signal of output expression sync mark " S ".This " S " signal is held and detects next mark.
After the pulse of received signal Si, in second preset time (hunting period 1/2 in) when the pulse of second signal Si having occurred, detect and be positive mark " 1 ", " 1 " signal of the output positive mark of expression " 1 ".At this moment, can not exist the pulse of signal Sj as condition to receiving second pulse the initial pulse from received signal Si yet.This " 1 " signal is held and detects next mark.
After the pulse of received signal Sj, in second preset time (hunting period 1/2 in) when the pulse of second signal Sj having occurred, detect and be negative flag " 0 ", " 0 " signal of output expression negative flag " 0 ".At this moment, can not exist the pulse of signal Si as condition to receiving second pulse the initial pulse from received signal Sj yet.This " 0 " signal is held and detects next mark.
With above-mentioned same, handle then with detuner 14.
Groove decline paraphase portion 74 has not only represented having or not of relevant paraphase portion with groove rising paraphase portion 75, the information that also comprise rising, descends.Therefore, can distinguish, generate signal Si, Sj.
In addition, in a hunting period, can utilize groove decline paraphase portion 74, groove rising paraphase portion 75, discern 3 kinds of implications (" S ", " 0 ", " 1 ").
In addition, because sync mark, positive mark, negative flag converge in the width of peak swing of swing, so can not increase crosstalking of adjacent inter-track.
In addition, interior Monday of CD side and outer Monday side not the length of the section of change disposed section, and the cut-off rule that there is no need the section of making piece is consistent with the radial direction of CD, so can realize CLV completely.
In addition, can be with a branch of smooth machined grooves and sync mark, positive mark, negative flag.
In addition, because the position of the peak swing of swing makes phase inversion, so can be with the position of high Precision Detection sync mark, positive mark, negative flag.
And, phase place that also can wobble detection, detecting groove decline paraphase portion 74, groove rising paraphase portion 75.At this moment, improved the SN ratio more than the edge that detects paraphase.
(variation 2)
Second variation of from Figure 21 to Figure 25, having represented the groove variations portion of embodiment 2.
In Figure 10,, in second variation of Figure 22, become groove decline rectangular portion 83, groove rising rectangular portion 84 respectively though used under the groove offset portion 66 on offset portion 65, the groove.Groove decline rectangular portion 83 is to connect the part of the peak of the groove of swinging with sine wave to paddy with rectangle.Promptly form groove with the level at peak, make its level that is changed to paddy sharp, form about 1/4 the part of hunting period then, link to each other with the part of the paddy of swing with the level of paddy from the peak of groove to about 1/4 the part of hunting period.In addition, groove rising rectangular portion 84 is to connect the part of the paddy of the groove of swinging with sine wave to the peak with rectangle.Promptly about 1/4 part from the paddy of groove to hunting period forms groove with the level of paddy, makes its level that is changed to the peak sharp, forms about 1/4 the part of hunting period then with the level at peak, links to each other with the part at the peak of swing.Groove decline rectangular portion, groove rising rectangular portion are generically and collectively referred to as the groove rectangular portion.In addition, the oscillatory wave that contains fluted rectangular portion, groove paraphase portion, groove offset portion etc. is called the distortion oscillatory wave.
As shown in figure 22, sync mark " S " is by part 85 expressions that comprised groove decline rectangular portion 83, groove rising rectangular portion 84 continuously, negative flag " 0 " is represented that by the part that only comprises groove decline rectangular portion 83 positive mark " 1 " is represented by the part that only comprises groove rising rectangular portion 85.Figure 21 has represented the details of groove decline rectangular portion 83.
Reading device with Figure 11 has read these marks.
Figure 18 has represented the difference signal of 3 pairing groove rectangular portion of mark shown in Figure 22.These difference signals are that the subtracter 4 from Figure 11 obtains.From difference signal Sa (S) as can be known, in groove rectangular portion part jumpy from the top down, obtained to bottom right difference signal jumpy, and in the part that the groove rectangular portion changes from top to bottom, obtained to upper right difference signal jumpy.
Figure 24 has represented to make difference signal to pass through the signal of Hi-pass filter 6.Difference signal jumpy shows as negative-going pulse to the bottom right, shows as direct impulse to upper right difference signal jumpy.
In Figure 25, represent signal that the pulse of forward is taken out as 2 value signals from comparer 52 with signal Si, represent the pulse of negative sense from the signal of comparer 54 with signal Sj as the taking-up of 2 value signals.
At this moment, arbiter 56 is worked as follows.
After the pulse of any one party of received signal Si or signal Sj, when (in hunting period) received the opposing party's pulse in preset time, detect and be sync mark " S ", " S " signal of output expression sync mark " S ".This " S " signal is held and detects next mark.
After the pulse of received signal Si, in preset time (in hunting period) do not have the pulse of signal Sj, detect and be positive mark " 1 ", " 1 " signal of the output positive mark of expression " 1 ".This " 1 " signal is held and detects next mark.
After the pulse of received signal Sj, when (in hunting period) do not have the pulse of signal Si in preset time, detect and be negative flag " 0 ", " 0 " signal of output expression negative flag " 0 ".This " 0 " signal is held and detects next mark.
With above-mentioned same, handle then with detuner 14.
Groove decline rectangular portion 83, groove rising rectangular portion 84 have not only been represented having or not of relevant rectangular portion, the information that also comprise rising, descends.Therefore, can distinguish, generate signal Si, Sj.
In addition, in a hunting period, can utilize groove decline rectangular portion 83, groove rising rectangular portion 84, discern 3 kinds of implications (" S ", " 0 ", " 1 ").
In addition, because sync mark, positive mark, negative flag converge in the width of peak swing of swing, so can not increase crosstalking of adjacent inter-track.
In addition, interior Monday of CD side and outer Monday side not the length of the section of change disposed section, and the cut-off rule that there is no need the section of making piece is consistent with the radial direction of CD, so can realize CLV completely.
In addition, can be with a branch of smooth machined grooves and sync mark, positive mark, negative flag.
In addition, be provided with rectangular portion, so can be with the position of high Precision Detection sync mark, positive mark, negative flag because stride the peak swing of swing.
Because the zero crossing of sinusoidal wave i.e. swing and the zero crossing of rectangular portion be at same position, so when from swing extraction clock signal, can be not random in the local clock signal of mark yet.
And in embodiment 2, the position of groove variations portion is difference owing to the mark of " S ", " 0 ", " 1 ", so the position of energy opening entry is also different.Position for unified energy opening entry can add the mark that appends.For example, in the form of Figure 10, as shown in figure 26, can append groove discontinuous 68.If opening entry after the detection of discontinuous 68 of groove, then can unify can opening entry the position.
(variation 3)
The 3rd variation of from Figure 27 to Figure 31, having represented the groove variations portion of embodiment 2.
In Figure 22, represent a mark with a distortion oscillatory wave.Specifically, represent negative flag " 0 " with a groove decline rectangular portion 83, represent positive mark " 0 " with a groove rising rectangular portion 84, with a rectangular portion to 85 (having comprised a groove decline rectangular portion 83 and a groove rising rectangular portion 84) expressions sync mark " S ".
In the 3rd variation shown in Figure 27, used the distortion oscillatory wave has been repeated the part of performance continuously.Promptly in the title portion 102 of a section 104 that in the section piece 105 of Fig. 2, comprises, make it have the oscillatory wave in given a plurality of cycles (for example 32 cycles).When for sync mark, shown in the epimere of Figure 27, rectangle repeats 85 in title portion 102, has a plurality of cycles (for example 32 cycles).When being negative flag " 0 ", shown in the stage casing of Figure 27,102 further groove decline rectangular portion 83 repeat in title portion, have a plurality of cycles (for example 32 cycles).When being positive mark " 1 ", shown in the hypomere of Figure 27,102 further groove rising rectangular portion 84 repeat in title portion, have a plurality of cycles (for example 32 cycles).
As other variation, be not limited to title portion 102, in comprising whole section 104 of recording portion 103, used the repetition of distortion oscillatory wave.In an example, because in a section, there is the oscillatory wave in 153 cycles, so use the distortion oscillatory wave for whole oscillatory waves in 153 cycles.
Specifically, in the whole field of the beginning section of section piece 105, repeat to comprise rectangle, in continuous 153 cycles, make rectangle in 85, have synchronizing information " S " 85 distortion oscillatory wave.Then in each remaining section of the section of beginning, when making it have negative information " 0 ", in the whole field of this section, repeat to comprise the distortion oscillatory wave of groove decline rectangular portion 83, continuous 153 cycles.Be in the section of being left equally, when making it have positive information " 1 ", in the whole field of this section, repeat to comprise the distortion oscillatory wave of groove rising rectangular portion 84, continuous 153 cycles.
And the repetition of distortion oscillatory wave can be or not the whole field of section, and the distortion oscillatory wave in a plurality of cycles is set at the arbitrary portion of section.In addition, having a plurality of cycles of distortion oscillatory wave can be every one cycle, also can be every a plurality of cycles.If vacate all period interval like this, can measure all period interval, make other information of carrying.
Like this, when using the distortion oscillatory wave because can write along oscillatory wave, so there is no need to obtain the inter-track that is used to write synchronizing information " S ", positive information " 1 " or negative information " 0 " every, only constitute the shape of the distortion oscillatory wave of magnetic track by observation, just can taking-up information.Therefore, there is no need a synchronizing information " S ", positive information " 1 " or negative information " 0 " and put into specific areas such as title portion 102, can any place of the section of being placed in.
For the beginning of detection segment piece exactly, shown in the epimere of Figure 27, in the oscillatory wave of beginning, be provided with discontinuous 86.As shown in figure 27, this discontinuous 86 can be arranged on going up or following peak part (amplitude largest portion) of oscillatory wave, also can be arranged on the zero crossing (amplitude least part) that groove decline rectangular portion 83 and groove rising rectangular portion 84 exist.Be preferably disposed on zero crossing, because when the wobble detection wave frequency, discontinuous 86 can not produce unnecessary noise.The explanation that forms discontinuous portion and embodiment 1 discontinuous is corresponding.
And, in Figure 27, be provided with discontinuous 86, thereon so can go wrong during write information because cut off the magnetic track groove.This is that reflection light quantity has very big difference, and reproducing signal is played interference because because the having or not of groove.At this, in this variation, the field (for example piece 85) of containing discontinuous 86 is distributed as VFO record field.So-called VFO record field is meant in order to reproduce then its recorded information, and the single-frequency signals that is used to introduce PLL is recorded the field of VFO.If VFO even then there are some to disturb, also only become local fluctuating, and does not cause direct mistake.Because VFO is a single-frequency, so the energy frequency separation is based on discontinuous 86 interference.
Figure 31 is the block diagram that reads the reading device of distortion oscillatory wave shown in Figure 27.
The reading device of Figure 31 is made of rectangular portion detecting device 90, discontinuous detecting device 91, distribution arbiter.Rectangular portion detecting device 90 has adopted the major part of the reading device of Figure 11.The signal waveform of the main point of rectangular portion detecting device 90 such as Figure 28, Figure 29, shown in Figure 30.
Figure 28 has represented and 3 difference signals that the distortion oscillatory wave is corresponding respectively shown in Figure 27.These difference signals are that the totalizer 4 from Figure 31 obtains.Its action is to illustrate with Figure 11.
Figure 29 has represented to make difference signal to pass through the signal of Hi-pass filter 6.Difference signal jumpy shows as negative-going pulse to the bottom right, shows as direct impulse to upper right difference signal jumpy.
In Figure 30, represent signal that the pulse of forward is taken out as 2 value signals from comparer 52 with signal Si, represent the pulse of negative sense from the signal of comparer 54 with signal Sj as the taking-up of 2 value signals.When being continuous rectangular portion, alternately showed pulse among signal Si and the signal Sj to 85 distortion oscillatory wave.These pulses are being that one ratio occurs in the one-period of distortion oscillatory wave.
Action when the distortion oscillatory wave in 153 cycles is arranged in a section is as described below.When being beginning section (having comprised synchronizing information " S "), in signal Si, showed 153 pulses, in signal Si, also showed 153 pulses.In addition, in subsequent segment,, 153 pulses in signal Sj, have been showed when being when containing the section of negative information " 0 ", has showed 0 pulse in signal Si.When being when having comprised the section of positive information " 1 ", has showed 153 pulses in signal Si, in signal Sj, showed 0 pulse in subsequent segment.In fact, because noise etc., it is many that umber of pulse can become, or tail off.
Discontinuous the detecting device 91 of Figure 31 adopted the major part of the reading device of Fig. 4.As illustrated with Fig. 5, detected discontinuous 86, exported pulse.And the subtracter 4 that is provided with in discontinuous detecting device 91 also can become totalizer.When having used subtracter, only the peak of oscillatory wave portion have discontinuous 86 o'clock, could detect, still, when having used totalizer, be not only in the peak of oscillatory wave portion, have discontinuous in zero crossing portion and also can detect in 86 o'clock.
Below, just the distribution arbiter 92 of Figure 31 is illustrated.
Distribution arbiter 92 is made of umber of pulse integrating instrument 93,94, comparer 95,96,97, section synchronous counter 98, breech lock 99.
Pulse integrating instrument 93,94 calculates the umber of pulse that is included among signal Si, the signal Sj respectively.The input a addition of the count value of pulse integrating instrument 93 and comparer 95,96,97, the input b addition of the count value of pulse integrating instrument 94 and comparer 95,96,97.Comparer 95 when a＞b (a is added to the count value of input among a, and b is the count value that is added among the input b), when preferably should difference very big (when a＞＞during b), exported high signal.Comparer 95 when a＜b, when preferably should difference very big (when a＜＜during b), exported high signal.Comparer 97 when a b, preferably should difference very hour, exported high signal.
These high signals are sent to breech lock 99.When comparer 95 has received high signal, " 1 " signal of the breech lock 99 output positive information of expression " 1 ".Should be held the information that detects a thin section by " 1 " signal.When comparer 96 has received high signal, " 0 " signal of breech lock 99 output expression negative informations " 0 ".Should be held the information that detects a thin section by " 0 " signal.When comparer 97 has received high signal, " S " signal of breech lock 99 output expression synchronizing informations " S ".Should be held the information that detects a thin section by " S " signal.
Section synchronous counter 98 calculates the periodicity (identical with the periodicity of oscillatory wave, still, when being oscillatory wave, owing to contain noise, number is unstable) of synchronizing signal.Synchronizing signal for example generates by the PLL circuit from the swinging signal that detects.At first, according to discontinuous detection pulse from discontinuous detecting device 91, it is 0 that count value is removed.Then, the periodicity of calculating synchronizing signal is a synchronizing pulse.In above-described example,,, just a reset signal is sent to umber of pulse integrating instrument 93,94 and breech lock 99 so whenever counted 153 synchronizing pulses because in a section, contain 153 oscillatory wave cycles.Be reset in umber of pulse integrating instrument 93,94 count values.
By the distribution arbiter, in a section, the umber of pulse that comprises among umber of pulse that comprises among the signal Si and the signal Sj relatively, when the umber of pulse of signal Si is Duoed much than the umber of pulse of signal Sj, exported high signal from comparer 95, on the contrary, when the umber of pulse of signal Sj is Duoed much than the umber of pulse of signal Si, exported high signal from comparer 96.When the umber of pulse of the umber of pulse of signal Si and signal Sj about equally the time, exported high signal from comparer 97.In breech lock 99, any one high signal breech lock of comparer 95,96,97 is lived output " 1 " signal or " 0 " signal or " S " signal.And according to " S " signal, section synchronous counter 98 is reset.
Then, with above-mentioned same, handle with detuner 14.
By repeating to be provided with the distortion oscillatory wave, can more correctly obtain " 1 " signal or " 0 " signal or " S " signal.In addition, if in the distortion oscillatory wave, also used the distortion oscillatory wave that contains fluted rectangular portion, because the harmful effect that oscillatory wave can cause the synchronizing signal that should detect originally is just few.
(variation 4)
Figure 32 has represented the structure of the major part of variation 4.In Figure 32, the amplitude of swing is different with length in the part of negative sense in the length of the part of forward, under the prerequisite of the frequency that does not change swing, makes the dutycycle difference.Be in 180 the part of Figure 32, the length of the amplitude of negative sense part is elongated, and in 181 part, the length of the amplitude of forward part is elongated.Shown in figure 32, form swing, when being negative information " 0 ", 180 part broadens, and when being positive information " 1 ", 181 part broadens.Like this, when differentiating positive information, negative information, there is no need, use clock timer instrumentation dutycycle just passable, so can alleviate The noise to the reproducing signal differential.
(variation 5)
Figure 33 has represented the structural drawing of the major part of variation 5.In the variation of Figure 27, in the oscillatory wave of beginning, be provided with discontinuous 86, still, in the variation of Figure 33, be provided with the mark 212 of the local chap of magnetic track groove.This mark 212 is the beginnings that are used to the section of discovery piece, also is called the piece mark.If the structure of Figure 33, just groove can not take place be cut off, become discontinuously, so on the piece mark, can not only write down VFO, can also write down various information.As a result, can reduce waste.
(variation 6)
Figure 34 has represented the structural drawing of the major part of variation 6.In the variation of Figure 34, be provided with the big mark 213 of the local change of magnetic track groove.Same with the variation 5 of Figure 33, in this structure, groove can not take place be cut off, on the piece mark, can not only write down VFO, can also write down various information.
(variation 7)
Figure 35 has represented the structural drawing of the major part of variation 7.It is characterized in that: only the edge of a side of magnetic track groove is provided with swing.In embodiment and variation so far, illustrated that recorded information is the optical disc recording medium of so-called groove record form on the magnetic track groove, but, CD in addition, also have along magnetic track, can go up the CD that record promptly has so-called land groove record form the both sides of groove and land (field that adjacent groove clips).Variation 7 is the suitable examples to land groove record form.
In Figure 35, on the edge of a side of groove, form expression negative information " 0 " (with 221 intervals of representing) or represent positive information " 1 " (with 231 intervals of representing).In view of the above, this groove 2 is represented with the same address of land 4 usefulness adjacent with it.Information is recorded among the both sides of land 4 and magnetic track groove 2.By carrying out such record, just can make inter-track every narrowing down, can further realize densification.
In sum, the present invention is on the magnetic track groove, the unit interval intercycle be provided with wriggling of given shape, and, in described unit interval, be set to different shapes by described shape according to the secondary information of on a meaning, recording and narrating, energy reduces or eliminates and add the calculated address, and can obtain the swing reproducing signal of single-frequency, thereby the optical disc recording medium that is applicable to densification can be provided.

Claims (10)

1. information medium comprises:
Track; With
Wobble along described track formation;
Wherein said wobble is included in the positive mark that forms in a plurality of unit of the special use that respectively has predetermined length, with the negative flag that forms in respectively having different special-purpose a plurality of unit of predetermined length, described positive mark and described negative flag are used for representing the positional information of described information medium.
2. information medium according to claim 1,
Wherein indicate described positive mark by groove part, compare with sine swing, the swing of positive mark further groove comprises steeper outside inclination angle, indicates described negative flag by groove part, compares with sine swing, and the swing of negative flag further groove comprises steeper inside inclination angle.
3. information medium according to claim 1, wherein each described unit is a sector.
4. information medium according to claim 1, wherein said positional information is the address.
5. information medium comprises:
Track; With
Wobble along described track formation;
Wherein said wobble is included in the positive mark that forms in a plurality of unit of the special use that respectively has predetermined length;
Wherein indicate positive mark, compare with sine swing by groove part, the swing of positive mark further groove comprise steeper outside inclination angle and
Wherein said positive mark is used for representing the positional information of described information medium.
6. information medium according to claim 5, wherein each described unit is a sector.
7. information medium according to claim 5, wherein said positional information is the address.
8. information medium comprises:
Track; With
Wobble along described track formation;
Wherein said wobble is included in the negative flag that forms in a plurality of unit of the special use that respectively has predetermined length;
Wherein, compare with sine swing by groove part indication negative flag, the swing of negative flag further groove comprise steeper inside inclination angle and
Wherein said negative flag is used for representing the positional information of described information medium.
9. information medium according to claim 8, wherein each described unit is a sector.
10. information medium according to claim 8, wherein said positional information is the address.
CNA2004100559426A 2000-01-14 2000-12-27 Optical disc and optical disc address reading apparatus and method, information medium Pending CN1560862A (en)

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